Finding the Fourth Proportional to 42,801.95, 64,109.31 and 21,705.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.95 : 64,109.31 = 21,705.64 : x
2. Step 2: Convert to fraction form
   42,801.95/64,109.31 = 21,705.64/x
3. Step 3: Cross multiply
   42,801.95x = 64,109.31 × 21,705.64
4. Step 4: Simplify right side
   42,801.95x = 1,391,533,361.84
5. Step 5: Solve for x
   x = 1,391,533,361.84/42,801.95
6. Step 6: Final answer
   x = 32,510.98